Collecting messages sent directly to the bot
To listen messages sent directly to the bot, no additional settings are required.
Private messages will begin to be collected from the moment the bot is connected to the service according to theinstructions.
Check that the collection of private messages is enabled in the bot settings in the service.

Additionally, you can set a welcome message that the bot will automatically send to the user.

Important! How to avoid collecting spam from third-party groups/channels?
Please note that your bot may be added to a third-party chat or channel without your knowledge, and spam will begin to be collected in the service, which will be counted in the statistics and, accordingly, in the final cost of the service.
After adding the Telegram bot, perform the actions specified inTHIS ARTICLE.
This will help avoid spam comments getting into the service.